The first one is Hifumi on the top right, in the actual game she's the Star Arcana and the expert Shogi player/Gravure model. She's also one of the more popular NPCs of the game thanks to her looks, character and her romance route, not to mention the broken abilities you get by maxing her out.
The second one is a little more shocking and that's Mishima right there on the bottom left. The reason why he's surprising is because he's one of the more involved NPCs, he's your classmate so you see him a lot unlike Hifumi. He also helps out the main character despite not really knowing "how" he actually deals with criminals and such. Otherwise, he's the Moon Arcana and his arc involves him feeling extremely weak and nearly giving into those thoughts, but he snaps out of it.
I feel both could potentially make it into the (inevitable) P5 remake/update as optional party members not unlike Yuffie and Vincent in FF7. Regular party members I don't see them being, cause that would unnecessarily bloat the game way more than it should.
Anyways just thought this was a neat little fact.